CN101741181A

CN101741181A - Motor for field of heating ventilation air conditioning

Info

Publication number: CN101741181A
Application number: CN200810217669A
Authority: CN
Inventors: 秦锐锋; 齐发云
Original assignee: Johnson Electric Shenzhen Co Ltd
Current assignee: Johnson Electric Shenzhen Co Ltd
Priority date: 2008-11-26
Filing date: 2008-11-26
Publication date: 2010-06-16
Anticipated expiration: 2028-11-26
Also published as: CN101741181B; US20100127587A1; JP2010130898A; JP5683098B2; US8288905B2; DE102009055806A1

Abstract

The invention provides a motor for the field of heating ventilation air conditioning (HVAC). The motor comprises a stator, a first end cover, a second end cover and a rotor, wherein the first end cover and the second end cover are arranged at two ends of the stator respectively; the rotor is arranged in the stator; the stator comprises four magnetic poles arranged inside the shell of the stator; the rotor comprises a rotating shaft and a commutator which is concentrically fixed to the rotating shaft; the commutator comprises even commutator segments each of which is electrically connected with the opposite commutator segment through a contour line; and the first end cover is provided with two electric brushes which are contacted with the commutator. The HVAC motor is a four-electrode motor of which the exciting frequency is greater than that of the conventional two-electrode motor, so that the vibration amplitude of the motor is reduced, the noise of the motor is reduced, and the harmonic noise of the motor is particularly improved. Furthermore, the HVAC motor saves two electric brushes so as to reduce friction between the electric brushes and the commutator and reduce the mechanical noise of the motor.

Description

The motor that is used for field of heating ventilation air conditioning

[technical field]

The present invention relates to machine field, relate in particular to the motor that is used for field of heating ventilation air conditioning (HVAC).

[background technology]

There is the requirement of low noise, high electromagnetic compatibility (EMC) in Heating,Ventilating and Air Conditioning (HVAC) (HVAC) field to motor.The noise of motor generally includes machinery noise, ventilation noise and electromagnetic noise.The factor that influences the machinery noise of motor comprises the friction of mounting means, brush and the commutator of end cap and motor housing, concentricity of rotor or the like.And the factor that influences the electromagnetic noise of motor comprises iron core, winding slot of magnetic pole, the rotor of stator etc.

The motor that adopt in existing HVAC field is the motor of 2 utmost points, 12 grooves normally, and this motor adopts two brushes usually, and these two brushes become 180 degree to distribute.This motor can produce stronger harmonic noise when moving, and comprises apparent in view 12 subharmonic (12th) and the harmonic wave of integral multiple thereof, for example 24 subharmonic (24th), 36 subharmonic (36th), 48 subharmonic (48th) and 60 subharmonic (60nd) or the like.

Therefore, need badly a kind of motor that can overcome above-mentioned shortcoming that is applicable to field of heating ventilation air conditioning is provided.

[summary of the invention]

At the above-mentioned existing high defective of motor noise that is used for field of heating ventilation air conditioning, the invention provides a kind of motor that is used for field of heating ventilation air conditioning of low noise.

For this reason, the invention provides a kind of motor that is used for field of heating ventilation air conditioning, described motor comprise stator, respectively be installed in the stator two ends first end cap and second end cap, be installed in the rotor in the described stator, described stator comprises four magnetic poles that are arranged on the stator casing inboard; Described rotor comprises rotating shaft and the commutator that is fixed to described rotating shaft with one heart, and described commutator comprises the even number commutator segment, and each commutator segment all is electrically connected with the commutator segment on its opposite by equipotential line; Described first end cap is equipped with two brushes and contacts with described commutator, and the angle of described two brushes is 80 ° to 100 °.

The beneficial effect that illustrated embodiment of the present invention has is: HVAC motor of the present invention is four utmost point motors, the excited frequency of four utmost points is greater than the excited frequency of existing two-pole machine, make the vibration amplitude of motor of the present invention reduce, and then reduced the noise of motor, especially improved the harmonic noise of motor; On the other hand, HVAC motor of the present invention has been saved two brushes than four traditional utmost point motors, thereby has reduced the mechanicalness noise between brush and the commutator.

[description of drawings]

Fig. 1 is the decomposing schematic representation of the motor of one embodiment of the invention;

Fig. 2 is the axial plane figure of the rear end cap of motor;

Fig. 3 is the overall schematic of motor, mainly shows the shell of rear end cap and stator;

Fig. 4 is the partial enlarged drawing of rear end cap;

Fig. 5 is the internal structure schematic diagram of rear end cap;

Fig. 6 is the internal structure schematic diagram of stator;

Fig. 7 is the side schematic view of rear end cap;

Fig. 8 is the schematic diagram after rear end cap is installed to stator casing;

Fig. 9 is the axial view of the part of rear end cap.

[embodiment]

In order to make technical problem to be solved by this invention, technical scheme and beneficial effect clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.

For simplicity, in this specification, will be called " front end housing " near the end cap of load end, the end cap that will deviate from load end is called " rear end cap ".

Fig. 1 is the decomposing schematic representation of 4 utmost points, the 14 groove motors of one embodiment of the invention.As shown in Figure 1, the motor of the present invention front end housing 4 and the rear end cap 1 that comprise rotor 2, stator 3 and be installed in the stator casing two ends.The stator casing installed inside has four magnetic poles, and these four magnetic poles can be formed by four blocks of magnet, also can be formed by two blocks of magnet, is perhaps formed by the iron-clad of a magnet in conjunction with stator.As mentioned above, the excited frequency of four utmost points makes the vibration amplitude of motor of the present invention reduce greater than the excited frequency of existing two-pole machine, and then has reduced the noise of motor.

Rotor 2 comprises rotating shaft 201, commutator 202 and iron core, and commutator 202 and iron core all are fixed to rotating shaft 201 with one heart.Commutator 202 comprises the even number commutator segment, and each commutator segment all is electrically connected with the commutator segment on its opposite by equipotential line.Equipotential line can be arranged on an end of the band hook of commutator, also can be arranged on the commutator the inside.It mainly is in order to reduce the quantity of brush, in the present embodiment, to be provided with after the equipotential line, only need to use two brushes, having reduced by two brushes that equipotential line is set.The minimizing of brush quantity helps to alleviate the friction between commutator 202 and the brush, has also saved the space of electric motor end cap simultaneously.

Fig. 2 is the axial plane figure of the rear end cap of motor, shows the internal structure of rear end cap.With reference to figure 2, rear end cap is equipped with brush 101 and contacts with commutator with 110.Rear end cap also is equipped with two

inductance coils

102 and 109, and wherein, a line end of inductance coil 102 is electrically connected with brush 101, and another line end is connected with the electric connecting sheet 104 of supply socket 106.Similarly, a line end of inductance coil 109 is electrically connected with brush 110, and another line end is connected with the electric connecting sheet 107 of supply socket 106.The

electric connecting sheet

104 and 107 of supply socket 106 is used to be connected external power source.The rear end cap inboard also is provided with

overhead kick

102 and 109, is respectively applied for the line end of fixed inductance coil 103 and 108.

Inductance coil

103 and 108 is mainly used to filtering, improves EMC (electromagnetic compatibility) ability of motor.Further, for obtaining better EMC ability, can also an electric capacity 107 be installed at rear end cap, the two poles of the earth of electric capacity 107 are electrically connected to two

electric connecting sheets

104 and 107 of supply socket respectively, and the mode of described electrical connection includes but not limited to welding.

Fig. 3 is the overall schematic of motor, mainly shows the shell of rear end cap and stator.As shown in Figure 3, in the present embodiment, supply socket 6 is installed in the rear end cap in the mode that fastens.Particularly, rear end cap is provided with the

clip slot

111 and 112 of at least two almost parallels, supply socket 106 has corresponding gulde edge, gulde edge can be inserted in the clip slot and by clip slot and clamp, in order further to reinforce supply socket 106, can also add back-off, perhaps in

clip slot

111 and 112, insert adhesive.The supply socket of this eye-splice-type has realized under the prerequisite of not changing rear end cap, selects for use suitable supply socket to satisfy the needs of dissimilar external power sources easily.As mentioned above, the outer end of two electric connecting sheets in the supply socket is used to connect external power source, and the inner is connected respectively to two inductance coils.In addition, in the middle of the rear end cap rotating shaft 201 that ball bearing is used for supporting rotor is installed, the part of ball bearing is exposed at outside the rear end cap.

Fig. 4 is the partial enlarged drawing of rear end cap.As shown in Figure 4, rear end cap is provided with brush box 114 and is used to install brush.Brush box 114 comprise both ends open the cavity that is used to be installed in brush, be installed in the outside openend of cavity lid 116, be installed in the elastic component 115 between brush and lid in the cavity, in the present embodiment, elastic component 115 is a spring.Lid 116 is installed in the brush box 114 in the mode that fastens.Particularly, the outside flange 117 that is provided with two almost parallels (with reference to figure 5) of the outside openend of brush box 114, lid 116 have two flange 118 that stretch out and are used to fasten two flanges 117.Further, the screens that protrusion can also be set of an end of flange 117 is used to prevent that lid 116 from skidding off flange 117.Convenient brush, the elastic component installed of the lid of this buckle-type.

For simplicity, with brush be defined as " length " of brush along motor length radially, with brush along motor shaft to length be defined as " highly " of brush, brush is defined as " thickness " of brush along the circumferential length of motor.In the present embodiment, brush is the cylinder of flat, and for example the cross section is the strip cylinder of rectangle, and the width of brush is less than the height of brush.Correspondingly, the cavity that being used to of brush box 114 installed brush also is a flat, brush along motor shaft to upside and downside respectively near the upside and the downside of the cavity inner wall of brush box 114.After preventing that brush from exhausting, elastic component 115 stretches out from the inside openend of cavity and touches commutator, elastic component 115 adopts the spring of diameter greater than brush width, hollows out with ccontaining this spring in brush box 114 both sides, and locating part 119 is set near inside openend.Like this, when brush shortened because of loss, it is just limited that the end of elastic component 115 is elongated to locating part 119, avoided this end to contact with commutator.

Fig. 5 is the internal structure schematic diagram of rear end cap, and Fig. 6 is the internal structure schematic diagram of stator and front end housing.As shown in Figure 5, in the rear end cap, the angle of two brushes is 80 ° to 100 °, is provided with air intake passage between two brushes, and the air inlet of this air intake passage is positioned at the rear end cap sidewall.Preferably, rear end cap comprises that also dividing plate 151 is positioned at sidewall, and dividing plate 151 is divided into the area of the area of first inlet, 141 and second inlet, 142, the first inlets 141 greater than second inlet 142 with air inlet along the rotation direction of rotor.Similarly, as shown in Figure 6, front end housing is provided with air outlet 401,402 etc.Inlet 141 and enter the mouth and 142 be communicated with above-mentioned air outlet 401,402 etc. by above-mentioned air intake passage, stator 2 with space between the rotor 3, the air channel of formation motor internal is used for the heat of timely drain motor inside.

Again with reference to figure 5 and Fig. 6, rear end cap have a snap ring 120 by interface end, the external diameter of snap ring 120 is slightly less than the internal diameter of stator casing to be installed in the stator casing.The end of stator casing is provided with the breach 301 to 305 of several asymmetric distribution, the outer surface of snap ring 120 be provided with several corresponding locating convex blocks 121 to 125 respectively with breach 301 to 305 interlocks.Further, when rear end cap was assembled to stator casing, wherein the end face of three locating convex blocks arrived to the bottom surface of corresponding breach respectively, has the space between the bottom of other locating convex block and breach.More preferably, the end face of these three locating convex blocks is positioned on the plane, and the end face of other locating convex blocks is positioned at outside this plane.In one embodiment, stator casing and front end housing can integratedly be made.During fabrication, can carry out finish turning to the inwall by the rear end cap place of stator casing handles.

Fig. 7 is the side schematic view of rear end cap.Because the external diameter of snap ring 120 is slightly less than the internal diameter of stator casing, more stable for the combination that makes both, snap ring 120 also comprises the axial fin that is positioned at outer surface.As shown in Figure 7, fin 131 is arranged between the end face of the end face of locating convex block 121 and snap ring, and similarly, fin 132 is arranged between the end face of the end face of locating convex block 122 and snap ring, and fin 135 is arranged between the end face of the end face of locating convex block 125 and snap ring.For the ease of snap ring is installed to stator casing, the radial thickness that leans on the snap ring end of fin is less than the radial thickness away from the snap ring end, make snap ring lean on the maximum outside diameter of end to be slightly less than the internal diameter of stator casing, and snap ring is slightly larger than the internal diameter of stator casing away from the end maximum outside diameter.Here, fin mainly plays radial location and fixing.Fin is also as the buffering media between rear end cap and the stator casing, and the vibration that alleviates motor to a certain extent reduces the noise of motor.

Fig. 8 is the schematic diagram after rear end cap is installed to stator casing.With reference to figure 6 and Fig. 8, the centre of front end housing 4 is provided with dead eye, during fabrication dead eye is carried out finish turning and handles.In addition, the mid portion of front end housing 4 outwards protrudes with respect to outer peripheral portion, forms ellipticity.

Fig. 9 is the axial view of the part of rear end cap.As shown in Figure 9, the arrow of dotted line is represented the rotation direction of commutator, in the present embodiment, brush 101 away from the rotation direction hypsokinesis of an end of commutator with respect to commutator, radially form back rake angle θ with motor.Back rake angle helps to improve the friction between commutator and the brush, reduces the noise of motor.Preferably, the scope of back rake angle θ is at 1 ° to 20 °.In this case, brush still is a cambered surface near the end face of commutator, and the peripheral curve of this cambered surface and commutator is coincide.As an improvement, the end face away from commutator of brush is the inclined-plane, and the inclined-plane is relative with the rotation direction of commutator.In this improvement project, when elastic component was exerted pressure to the inclined-plane of brush, this pressure can be decomposed into two components, and one-component is along the length direction of brush, and the one-component component is perpendicular to the length direction of brush.Wherein, identical to the direction of the frictional force of brush perpendicular to the direction of the component of length direction with commutator, thus brush can be stabilized in a side of brush box cavity, reduce the vibration of brush, alleviate the noise of motor.

The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.

Claims

1. motor that is used for field of heating ventilation air conditioning, described motor comprise stator, respectively be installed in the stator two ends first end cap and second end cap, be installed in the rotor in the described stator, it is characterized in that described stator comprises four magnetic poles that are arranged on the stator casing inboard; Described rotor comprises rotating shaft and the commutator that is fixed to described rotating shaft with one heart, and described commutator comprises the even number commutator segment, and each commutator segment all is electrically connected with the commutator segment on its opposite by equipotential line; Described first end cap is equipped with two brushes and contacts with described commutator, and the angle of described two brushes is 80 ° to 100 °.

2. motor according to claim 1 is characterized in that, is provided with air intake passage between described two brushes, and the air inlet of described air intake passage is positioned at the sidewall of described first end cap; Described second end cap is provided with air outlet; Described air outlet is communicated with described air inlet by described stator with space and air intake passage between the rotor.

3. motor according to claim 2, it is characterized in that, described first end cap comprises that also dividing plate is positioned at described sidewall, and described dividing plate is divided into first inlet and second inlet with described air inlet along the rotation direction of described rotor, and the area of described first inlet is greater than described second area that enters the mouth.

4. motor according to claim 1 is characterized in that, described first end cap also is equipped with two inductance coils and an electric capacity, and line end of each inductance coil is electrically connected with a corresponding brush, and another line end is used to connect external power source; The described first end cap inboard also is provided with the line end that is connected with brush point that overhead kick is used for fixing described inductance coil; The two poles of the earth of described electric capacity are electrically connected to the line end that is electrically connected with external power source of described two inductance coils respectively.

5. motor according to claim 4 is characterized in that, described first end cap also comprises supply socket, the clip slot of at least two almost parallels of the described first end cap setting, and described supply socket has corresponding gulde edge to be installed in the described clip slot; Be provided with two electric connecting sheets in the described supply socket, the outer end of described two electric connecting sheets is used to connect external power source, and the inner is connected respectively to described two inductance coils.

6. motor according to claim 1, it is characterized in that, described brush is installed in the brush box of first end cap, described brush box comprise both ends open the cavity that is used to accommodate brush, be installed in the outside openend of described cavity lid, be installed in the elastic component between described brush and lid in the described cavity; The outside openend of described brush box is provided with the outside flange of two almost parallels, and described lid has two flange that stretch out and is used to fasten described two flanges; The screens that one end of described flange has protrusion is used to prevent that described lid from skidding off described flange.

7. motor according to claim 6 is characterized in that, described brush is a cylinder, described brush along motor shaft to height greater than it along the circumferential width of motor; Described brush along motor shaft to upside and downside respectively near the upside and the downside of the cavity inner wall of described brush box; Described elastic component is the spring of diameter greater than brush width, and the inside opening part of the cavity of described brush box is provided with locating part and prevents that described spring from stretching out described cavity.

8. motor according to claim 7, described snap ring also comprises the outer surface of axial fin between described locating convex block and snap ring end face, described fin by the radial thickness of snap ring end less than radial thickness away from the snap ring end, make described snap ring be slightly less than the internal diameter of described stator casing, be slightly larger than the internal diameter of described stator casing away from the end maximum outside diameter by the maximum outside diameter of end.

9. motor according to claim 1 is characterized in that, described rotor comprises 14 winding slots.

10. motor according to claim 9 is characterized in that, in the middle of described first end cap bearing is installed, and the part of described bearing is exposed at outside described first end cap; The mid portion of described second end cap outwards protrudes formation ellipticity with respect to outer peripheral portion, and described mid portion is equipped with bearing; The coaxial bearing ground of the bearing of described first end cap and described second end cap supports the rotating shaft of described rotor.

11., it is characterized in that tilting away from an end of the described commutator rotation direction against described commutator of described brush radially forms back rake angle with motor according to any described motor in the claim 1 to 10.

12. motor according to claim 11 is characterized in that, described brush is a cambered surface near the end face of described commutator, is the inclined-plane away from the end face of described commutator, and described inclined-plane is relative with the rotation direction of described commutator.

13. motor, described motor comprise stator, respectively be installed in the stator two ends first end cap and second end cap, be installed in the rotor in the described stator, it is characterized in that, described first end cap comprises a snap ring, and the external diameter of described snap ring is slightly less than the internal diameter of described stator casing so that described snap ring is installed in the described stator casing; The end of described stator casing is provided with the breach more than three, the outer surface of described snap ring is provided with corresponding locating convex block and described breach interlock, wherein the end of three locating convex blocks arrives to the bottom of described breach, has the slit between the end face of other locating convex blocks and the bottom of described breach.